It consists of two parts: pillow changing clamp and shield plate. First of all, the large shield plate can easily and quickly remove the subgrade gravel around the sleeper that needs to be replaced, and then use its hydraulic grab to clamp the sleeper that needs to be replaced and pull it out of the track bed, and put the new sleeper into the track bed under the rail. Then use the large shield plate to smooth the subgrade gravel. To clear, change, leveling is completed at one time, the average 30-60 seconds to replace a tie, convenient and fast.